A president is installed only if the electoral system doesn't come to a result and it takes either the House/Senate or the SCOTUS at which point they may choose ANY president, not any of the candidates.
Hence when RBG said she wants to 'install' a president, that means she found neither candidate qualified and would choose a different president altogether.
I am fairly convinced the Democrat party has already made this the case, if Biden 'wins', the Democrats will replace Biden right at the electoral college and install their own candidate (Biden is only the Manchurian Candidate). If the election becomes a tie, they'll do it either at the House or SCOTUS levels.
Both Biden and Harris have let these facts slip already, when they both called it the "Harris administration".